DS1822Z+T&R; datasheet, PDF - EEWORLD Datasheet

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DS1822Z+T&R;: DescriptionSENSOR TEMPERATURE 1-WIRE 8SOIC; CategoryThe sensor; File Size217KB，21 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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DS1822Z+T&R; Overview

SENSOR TEMPERATURE 1-WIRE 8SOIC

DS1822Z+T&R; Parametric

Parameter Name	Attribute value
sensor type	digital, local
Check temperature - local	-55°C ~ 125°C
Detect temperature - remote	-
Output type	1-Wire®
Voltage - Power	3 V ~ 5.5 V
resolution	11 b
characteristic	Output switch, programmable limits, standby mode
Accuracy - highest (lowest)	±2°C（±3°C）
Test Conditions	-10°C ~ 85°C（-55°C ~ 125°C）
Operating temperature	-55°C ~ 125°C
Installation type	surface mount
Package/casing	8-SOIC (0.154", 3.90mm wide)
Supplier device packaging	8-SOIC

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DS1822

Econo 1-Wire Digital

Thermometer

BENEFITS AND FEATURES

•

Unique 1-Wire Interface Requires Only One

Port Pin for Communications

Can Be Powered from Data Line

Power-Supply Range is 3.0V to 5.5V

Reduced Component Count with Integrated

Temperature Sensor and Interface

Requires No External Components

Measures temperatures from -55°C to

+125°C (-67°F to +257°F)

±2.0°C

Accuracy from -10°C to +85°C

Thermometer Resolution is User-Selectable

from 9 to 12 Bits

Converts Temperature to 12-Bit Digital Word

in 750ms (max)

Simplifies Distributed Temperature Sensing

with Multidrop Capability

Each Device Has a Unique 64-Bit Serial

Code Stored in an On-Board Device

Flexible, User-Definable Nonvolatile

(NV) Alarm Settings with Alarm Search

Command Identifies Devices with

Temperatures

Outside

Programmed

Limits

Software compatible with the DS18B20

Applications Include Thermostatic Controls,

Industrial Systems, Consumer Products,

Thermometers, or Any Thermally Sensitive

System

PIN ASSIGNMENT

DALLAS

1822

1 2 3

GND

DS1822

•

8-Pin 150mil SO

(DS1822Z)

•

(BOTTOM VIEW)

TO-92

(DS1822)

PIN DESCRIPTION

GND

- Ground

- Data In/Out

- Power Supply Voltage

- No Connect

•

DESCRIPTION

The DS1822 digital thermometer provides 9- to 12-bit centigrade temperature measurements and has an

alarm function with NV user-programmable upper and lower trigger points. The DS1822 communicates

over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a

central microprocessor. It has an operating temperature range of –55°C to +125°C and is accurate to

±2.0°C

over the range of –10°C to +85°C. In addition, the DS1822 can derive power directly from the

data line (“parasite power”), eliminating the need for an external power supply.

Each DS1822 has a unique 64-bit serial code, which allows multiple DS1822s to function on the 1-Wire

bus; thus, it is simple to use one microprocessor to control many DS1822s distributed over a large area.

Applications that can benefit from this feature include HVAC environmental controls, temperature

monitoring systems inside buildings, equipment or machinery, and process monitoring and control

systems.

1-Wire is a registered trademark of Maxim Integrated Products,

Inc.

1 of 21

GND

1 2

042815

DS1822

OPERATION—ALARM SIGNALING

After the DS1822 performs a temperature conversion, the temperature value is compared to the user-

defined two’s complement alarm trigger values stored in the 1-byte T

and T

registers (see Figure 3).

The sign bit (S) indicates if the value is positive or negative: for positive numbers S = 0 and for negative

numbers S = 1. The T

and T

registers are NV (EEPROM) so they will retain data when the device is

powered down. T

and T

can be accessed through bytes 2 and 3 of the scratchpad as explained in the

MEMORY section of this data sheet.

AND T

Figure 3

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

Only bits 11 through 4 of the temperature register are used in the T

and T

comparison since T

and T

are 8-bit registers. If the measured temperature is lower than or equal to T

or higher than or equal to T

an alarm condition exists and an alarm flag is set inside the DS1822. This flag is updated after every

temperature measurement; therefore, if the alarm condition goes away, the flag will be turned off after the

next temperature conversion.

The master device can check the alarm flag status of all DS1822s on the bus by issuing an Alarm Search

[ECh] command. Any DS1822s with a set alarm flag will respond to the command, so the master can

determine exactly which DS1822s have experienced an alarm condition. If an alarm condition exists and

the T

or T

settings have changed, another temperature conversion should be done to validate the alarm

condition.

POWERING THE DS1822

The DS1822 can be powered by an external supply on the V

pin, or it can operate in “parasite power”

mode, which allows the DS1822 to function without a local external supply. Parasite power is very useful

for applications that require remote temperature sensing or that are very space constrained. Figure 1

shows the DS1822’s parasite-power control circuitry, which “steals” power from the 1-Wire bus via the

DQ pin when the bus is high. The stolen charge powers the DS1822 while the bus is high, and some of

the charge is stored on the parasite power capacitor (C

) to provide power when the bus is low. When the

DS1822 is used in parasite power mode, the V

pin must be connected to ground.

In parasite power mode, the 1-Wire bus and C

can provide sufficient current to the DS1822 for most

operations as long as the specified timing and voltage requirements are met (refer to the DC

ELECTRICAL CHARACTERISTICS and the AC ELECTRICAL CHARACTERISTICS sections of this

data sheet). However, when the DS1822 is performing temperature conversions or copying data from the

scratchpad memory to EEPROM, the operating current can be as high as 1.5mA. This current can cause

an unacceptable voltage drop across the weak 1-Wire pullup resistor and is more current than can be

supplied by C

. To assure that the DS1822 has sufficient supply current, it is necessary to provide a

strong pullup on the 1-Wire bus whenever temperature conversions are taking place or data is being

copied from the scratchpad to EEPROM. This can be accomplished by using a MOSFET to pull the bus

directly to the rail as shown in Figure 4. The 1-Wire bus must be switched to the strong pullup within

10µs (max) after a Convert T [44h] or Copy Scratchpad [48h] command is issued, and the bus must be

held high by the pullup for the duration of the conversion (t

conv

) or data transfer (t

= 10ms). No other

activity can take place on the 1-Wire bus while the pullup is enabled.

The DS1822 can also be powered by the conventional method of connecting an external power supply to

the V

pin, as shown in Figure 5. The advantage of this method is that the MOSFET pullup is not

required, and the 1-Wire bus is free to carry other traffic during the temperature conversion time.

5 of 21

DS1822Z+T&R; Related Products

	DS1822Z+T&R;	DS1822Z/T&R	DS1822+T&R;	DS1822Z/T&R;
Description	SENSOR TEMPERATURE 1-WIRE 8SOIC	IC thermometer econo dig 8-soic	SENSOR TEMPERATURE 1-WIRE TO92-3	SENSOR TEMPERATURE 1-WIRE 8SOIC
sensor type	digital, local	-	digital, local	digital, local
Check temperature - local	-55°C ~ 125°C	-	-55°C ~ 125°C	-55°C ~ 125°C
Output type	1-Wire®	-	1-Wire®	1-Wire®
Voltage - Power	3 V ~ 5.5 V	-	3 V ~ 5.5 V	3 V ~ 5.5 V
resolution	11 b	-	11 b	11 b
characteristic	Output switch, programmable limits, standby mode	-	Output switch, programmable limits, standby mode	Programmable limits, standby mode
Accuracy - highest (lowest)	±2°C（±3°C）	-	±2°C（±3°C）	±2°C（±3°C）
Test Conditions	-10°C ~ 85°C（-55°C ~ 125°C）	-	-10°C ~ 85°C（-55°C ~ 125°C）	-10°C ~ 85°C（-55°C ~ 125°C）
Operating temperature	-55°C ~ 125°C	-	-55°C ~ 125°C	-55°C ~ 125°C
Installation type	surface mount	-	Through hole	surface mount
Package/casing	8-SOIC (0.154", 3.90mm wide)	-	TO-226-3, TO-92-3 (TO-226AA) (formed lead)	8-SOIC (0.154", 3.90mm wide)
Supplier device packaging	8-SOIC	-	TO-92-3	8-SOIC

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